Loading…
Loading…
GCSE Biology · key term
A hormone released by the pituitary gland that increases the permeability of the kidney's collecting ducts to water.
Used by Edexcel
Specification 7.20B · Paper 2
Revise: Effect of ADHWhen there is too little water, the pituitary gland releases more ADH (antidiuretic hormone) into the bloodstream. ADH acts on the collecting duct, making it more permeable to water. More water can therefore pass out of the duct and be reabsorbed into the blood.
Link each change in ADH to collecting-duct permeability, water reabsorption and the volume and concentration of urine.
Do not say that ADH adds water to the blood: it changes how much water is reabsorbed from the fluid that will become urine.
Create a free account to read GCSE Biology revision notes for your exam board and track your progress.